A form of EM radiation associated with Time Travel.
EM radiation of a higher frequency than even gamma, it is not normally seen in nature and most systems are not created to even detect it. As Gamma radiation badly affect solid matter, Chronal Radiation, affects space time. In its natural rampant form it can and does cause temporal anomalies like a small and short time loop, skipped or missing minutes or even 'shadows of other timelines'. When harnessed and polarized, it can bend space time to create anything from simple portals to actual time travel.